New diorganotin (IV) complexes of the type Ph 2 SnL 2 , Bu 2 SnL 2 and Me 2 SnL 2 of the ligand benzamidocysteine (L H ). Ligand formed by reaction of benzoyl chloride with cysteine in presence of sodium hydroxide. The prepared complexes were characterized by elemental analysis, infrared, conductance measurements and nuclear magnetic resonance ( 1 H, 13 C and 119 Sn NMR) spectral data. From the spectral measurements, monomer structures for the complexes were proposed. Bidentate and Octahedral geometry was proposed for the complexes prepared. Preliminary in vitro tests for fungicidal activity show that all prepared compounds display good activity to Gibberela, Cercospora arachidicola, Physolospora piricola and Fusarium oxysporum.

New metal complexes of type M2(HL)2.4H2O[(M = Co(II), Ni (II) and Cu (II)] were prepared using the ligand (HL) =2-[(1H-Pyrrol-2-ylimino methyl)]-5-(2-hydoxy-phenyl)-[1,3,4-thiadiazol]. The Schiff bases were was condensed from [1H-Pyrrole-2-carbaldehyde] with [2-amino-5-(2-hydroxy-phenyl-1,3,4-thiadiazole] in alcoholic medium. The prepared complexes were characterized by FTIR, UV-vis, 1H-NMR and mass spectra as well as magnetic susceptibility measurements, thermal analysis. The activation thermodynamic parameters, such as ΔE * , ΔH * , ΔS * and ΔG * are calculated from the TGA curve using Coats-Red fern method. From the spectral measurements, structures for the complexes were proposed. Preliminary in vitro tests for antimicrobial activity show that all prepared compounds display good activity to Staphylococcus aureus, Escherishia coli, Pseudononas aeroginosa and Cndida albicans.

The photochemistry of Tris(ethylxanthato) iron(III) was studied in five organic solvents: dimethyl sulfoxide (DMSO), methanol, acetone, ethyl acetate and Benzene .Monochromatic light of wavelength 365 nm was used for the irradiation process at 25 o C. Uv-visible spectral changes and other observations indicated an intra oxidation-reduction reaction occuring during the photolysis of Fe(etx) 3 complex, with homolytic scission of Fe S bond. The quantum yield ( d ), rate of photodecomption and reactivity ratio (k 2 /k -1 ) were determined in each solvent. These values always increase as the polarity of the solvent increased and following the order. DMSO > Methanol > Acetone > Ethyl acetate > BenzeneAccording to the experimental results obtained, the mechanism of photodecomption of these complexes under the applied conditions was proposed.